The retroclient.exe process listens, in a default configuration, on TCP
port 497.
When Continued sending packets with length of 2064 bytes and filling with
0x00,
about 30 seconds to 5 minutes the status box shows: “Client networking
not available, or service not running” , keep on sending packets and few
times later retroclient.exe process terminate, backup service lost, TCP
port 497 closed .

-- Vendor Response:
EMC has issued an update to correct this vulnerability:

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